Download App

1. Some basic concept of chemistry — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
$8\,g \,O_2$ has same number of atoms as that in
  • A
    $14g\, CO$
  • ✓
    $7g \,CO$
  • C
    $11g\, CO_2$
  • D
    $22g\, CO_2$
✓

Answer

Correct option: B.
$7g \,CO$
b
mole $(\mathrm{n})=\frac{\text { weight }(\mathrm{w})}{\text { atomic wt. }}=\frac{\mathrm{No.} \text { of } \operatorname{atom}(\mathrm{N})}{\mathrm{N}_{\mathrm{A}}}$

in $8\, \mathrm{g}\, \mathrm{O}_{2}$ No. of atom

$\frac{8}{16}=\frac{N}{N_{A}} \Rightarrow N=\frac{N_{A}}{2}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 1. Some basic concept of chemistry→1. Some basic concept of chemistry — all question types→Chemistry STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Choose the Incorrect Statement about Dalton's Atomic Theory
→
$25\, mL$ of the given $HCl$ solution requires $30\, mL$ of $0.1\, M$ sodium carbonate solution. What is the volume of this $HCl$ solution required to titrate $30\, mL$ of $0.2\, M$ aqueous $NaOH$ solution? .............. $\mathrm{mL}$
→
$p-$ orbitals of an atom in presence of magnetic field are
→
Which of the following is not correct?
→
Cause of diagonal relationship is
→
The exothermic formation of $ClF_3$ is represented by the equation

$C{l_{2\left( g \right)}} + 3{F_2}_{\left( g \right)} \rightleftharpoons 2C{l_3}_{\left( g \right)};\Delta {H_r} =  - 329\,kJ$ 

Which of the following will increase the quantity of $ClF_3$ in an equilibrium mixture of $Cl_2, F_2$ and $ClF_3$ ?

→
For a reaction; $A + B \rightleftharpoons C + D$ , the initial concentration of $A$ and $B$ are equal but the equilibrium concentration of $C$ is twice that of equilibrium concentration of $A$. The $K_c$ is
→
Which reaction is not possible
→
When CH4 reacts with steam at 1273K in the presence of nickel catalyst to form CO and:
→
$A(g) \to 2B (g)$ ; $\Delta_rH = 20\, kJ/mol$ at $300\,K$. if $C_{p,m} (A) = 20\, J\,K^{-1} \,mol^{-1}$ $C_{p,m} (B) = 5\, J\,K^{-1} \,mol^{-1}$ which of the following statement is correct -
→